Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 175/90-18 | 405/70-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 30.4 (772.2) | 42.32 (1075) | 11.92 (302.8) 39.2% |
| Width inches (mm) | 6.89 (175) | 15.94 (405) | 9.06 (230) 131.4% |
| Circum. inches (mm) | 95.51 (2425.94) | 132.96 (3377.21) | 37.45 (951.27) 39.2% |
| Sidewall Height inches (mm) | 6.2 (157.5) | 11.16 (283.5) | 4.96 (126) 80% |
| Revolutions per mile (km) | 663.39 (412.21) | 476.53 (296.1) | -186.86 (-116.11) -28.2% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 27.84 mph (44.81 km/h) |
| 25 mph (40.23 km/h) | 34.8 mph (56.01 km/h) |
| 30 mph (48.28 km/h) | 41.76 mph (67.21 km/h) |
| 35 mph (56.33 km/h) | 48.72 mph (78.41 km/h) |
| 40 mph (64.37 km/h) | 55.69 mph (89.62 km/h) |
| 45 mph (72.42 km/h) | 62.65 mph (100.82 km/h) |
| 50 mph (80.47 km/h) | 69.61 mph (112.02 km/h) |
| 55 mph (88.51 km/h) | 76.57 mph (123.22 km/h) |
| 60 mph (96.56 km/h) | 83.53 mph (134.42 km/h) |
| 65 mph (104.61 km/h) | 90.49 mph (145.63 km/h) |
| 70 mph (112.65 km/h) | 97.45 mph (156.83 km/h) |
| 75 mph (120.7 km/h) | 104.41 mph (168.03 km/h) |
| 80 mph (128.75 km/h) | 111.37 mph (179.23 km/h) |
| 85 mph (136.79 km/h) | 118.33 mph (190.44 km/h) |
| 90 mph (144.84 km/h) | 125.29 mph (201.64 km/h) |
| 95 mph (152.89 km/h) | 132.25 mph (212.84 km/h) |
| 100 mph (160.93 km/h) | 139.21 mph (224.04 km/h) |
| 2.35 | 2.73 | 2.94 | 3.07 | 3.21 | 3.31 | 3.42 | 3.55 | 3.73 | 3.91 | 4.11 | 4.27 | 4.56 | 4.88 | 5.13 | 5.29 | 5.38 | 5.71 | 6.17 | 7.17 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1213 | 1409 | 1517 | 1584 | 1656 | 1708 | 1765 | 1832 | 1925 | 2018 | 2121 | 2203 | 2353 | 2518 | 2647 | 2730 | 2776 | 2947 | 3184 | 3700 |
Better Fuel Economy Factory Ratios Increased Power
